<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
    <head>
        <title>Title</title>
        <script src="<%=request.getContextPath()%>/js/jquery-3.3.1.min.js"></script>

        <script>

            $(function () {


                $("a").click(function () {
                    $("#image").prop("src","<%=request.getContextPath()%>/show.code?a="+new Date().getTime());
                });

            });

        </script>
    </head>
    <body>
        <form action="<%=request.getContextPath()%>/submit.code" method="post">
            <a href="javascript:"><img id="image" src="<%=request.getContextPath()%>/show.code"/></a>
            <a href="javascript:">换一张</a>
            <input type="text" name="code" size="5"/><br/>
            <input type="submit" value="提交"/>
        </form>

        <%
            String message= (String) request.getAttribute("message");
            if(message!=null){
                out.print(message);
            }
        %>
    </body>
</html>
